Avoid Overpaying for Loose Opals: N1–N9 and a 5 Point Buyer Checklist
Avoid Overpaying for Loose Opals: N1–N9 and a 5 Point Buyer Checklist
Loose opal grading comes down to five factors, and two of them decide most of the price: body tone on the N1–N9 scale and the bri…